Reduce console spam from master_preferences.
Reduce console spam from master_preferences.

It's ok (and common) for master preferences to not exist.

TEST=compiles

Review URL: http://codereview.chromium.org/3413022

git-svn-id: http://src.chromium.org/svn/trunk/src@59984 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 08898066cd1943b53b3d2bda72702f462f8d2eeb
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser